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Maths
GCSE

Solve 2x^2 - 3x - 1 = 0, using the quadratic formula. Give your answer to two decimal places.

To start, let us recall the form of a quadratic equation. y = ax2 + bx + c. When making x the subject of the formula and setting y = 0, we get the quadratic formula, as you may have seen before...

JW
Answered by Jason W. • Maths tutor
11792 Views

How can you expand brackets? e.g: (x-4)(x+7)

The answer is of the form ax2+bx+c The a term is found by the product of the coefficients of the x in the brackets. e.g (2x+7)(-4x+6) would give -8

ST
Answered by Sam T. • Maths tutor
5787 Views

The turning point on a quadratic function

often with functions you may be required to find the maximum or minimum point in a curve. This can be especially present in a quadratic function. These are functions that have an x raised to the power of ...

AG
Answered by Ankur G. • Maths tutor
4713 Views

Solve the equation: (2x+3)/(x-4)-(2x-8)/(2x+1)=1

By solving this equation we are trying to find the value of x. First we must combine the two fractions into one by finding the common denominator. The least common denominator in this case is (x-...

EW
Answered by Erin W. • Maths tutor
3500 Views

A car costs £300. The price is then reduced by 20%. However, the shop increases the new price by 15%. Fadhila says, "20 - 15 = 5, so the original price of the car has been reduced 5%". Is she right? What is the final price of the car?

Fadhila is wrong. To work out price increases/decreases we need to multiply the original price by a decimal number. A reduce by 20% means multiplying by 0.8: we need to take away 20% of the original numbe...

ET
Answered by Emma T. • Maths tutor
4104 Views

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