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Solve 2x^2 + 6x + 4 = 0 for x using the quadratic formula.

When you look at the question you can see that you have been given a quadratic equation. These tend to come in the format ax^2 + bx + c = 0. Remember it may not always be x, it could be y or z, or another...

Answered by Phoebe N. • Maths tutor

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If f(x) = x^2 - x + 7, find f(3)

f (3) = (3)² - (3) + 7
= 9 - 3 + 7
= 13

Answered by Sagar J. • Maths tutor

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Find the equation of the straight line passing through the points (7,5) and (8, 2)

To find the equation of a straight line we need two things, the gradient of the line and a point lying on the line. To find the gradient of this line we use the gradient formula: m = (y₂-y

Answered by Rory S. • Maths tutor

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Solve the equation: x^2 - 9x + 20 = 0

This is a quadratic equation, and is likely that x can satisfy either of two values. We know these must multiply to form 20 and summate to -9, and thus they are (x-4) and (x-5). Hence, x is either 4 or 5....

Answered by Pippa M. • Maths tutor

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