*I highly recommend the following textbook for both GCSE(9-1) and IGCSE(9-1).The book covers every single topic in depth and offers plenty of questions to practise.Take the extra half a second to find the right answer the right way.*

*I highly recommend the following textbook for both GCSE(9-1) and IGCSE(9-1).The book covers every single topic in depth and offers plenty of questions to practise.Take the extra half a second to find the right answer the right way.*

So we can just resort to the quadratic formula here. So this would be the same thing as the square root of four times the square root of 21, which of course is two times the square root of 21, all of that over two.

So the roots are going to be x is equal to negative b. So negative of negative two is gonna be positive two, plus or minus the square root of b squared, which is four, minus four times a, which is one, times negative 20. And since that's a negative 20 but I'm subtracting it, I could put a plus there. But let's see if we can get to the right solution here. This is going to, x is going to be equal to two plus or minus.

This is the best book that can be recommended for the new A Level - Edexcel board: it covers every single topic in detail;lots of worked examples; ample problems for practising; beautifully and clearly presented.

The roots of this equation -2 and -3 when added give -5 and when multiplied give 6. Problem 1: Solve for x: x 11x 7x 7 = 0 → 11x(x 1) 7(x 1) = 0 → (x 1)(11x 7) = 0 → x 1 = 0 or 11x 7 = 0 → x = -1 or x = -7/11.

The frame will be cut out of a piece of steel, and to keep the weight down, the final area should be 28 cm when: x is about −9.3 or 0.8 The negative value of x make no sense, so the answer is: x = 0.8 cm (approx.) There are two speeds to think about: the speed the boat makes in the water, and the speed relative to the land: We can turn those speeds into times using: time = distance / speed (to travel 8 km at 4 km/h takes 8/4 = 2 hours, right?

) And we know the total time is 3 hours: total time = time upstream time downstream = 3 hours Put all that together: Two resistors are in parallel, like in this diagram: The total resistance has been measured at 2 Ohms, and one of the resistors is known to be 3 ohms more than the other. The formula to work out total resistance "R = 3 Ohms is the answer. Quadratic Equations are useful in many other areas: For a parabolic mirror, a reflecting telescope or a satellite dish, the shape is defined by a quadratic equation.

And we would get x squared minus two x minus 20 is equal to zero. Now we have this quadratic in a form where we just need to figure out what x values are gonna make this expression equal to zero. And I don't tell people to memorize a lot in life, but the quadratic formula is one of those things that it's not a bad idea to memorize. So it looked like a fairly benign thing, but we had to multiply it out, set it up in kind of a form where the quadratic formula would apply, and we got a fairly hairy answer.

And we're starting to get to the home stretch. When the quadratic formula tells us that if I have ax squared plus bx plus c is equal to zero, then the solutions of this quadratic equation are going to be x is equal to negative b plus or minus the square root of b squared minus four ac all of that over two a. So if you divide each of these by two, which we are doing right here, it's going to be one plus or minus the square root of 21, which is this choice right over there.

When you throw a ball (or shoot an arrow, fire a missile or throw a stone) it goes up into the air, slowing as it travels, then comes down again faster and faster ... and a Quadratic Equation tells you its position at all times! There are many ways to solve it, here we will factor it using the "Find two numbers that multiply to give a×c, and add to give b" method in Factoring Quadratics: a×c = A very profitable venture.

Your company is going to make frames as part of a new product they are launching.

## Comments Problem Solving Quadratic Equations

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