More factorising - quadratics (OCR GCSE Maths): Quizzes

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More factorising - quadratics
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What form does a quadratic expression take?

ax2+bx+cax^2 + bx + c

To factorise x2+bx+cx^2 + bx + c, two numbers mm and nn must add to give what?

The coefficient bb

What is x2+7x+10x^2 + 7x + 10 factorised?

(x+2)(x+5)(x+2)(x+5)

What is p2+2p−15p^2 + 2p - 15 factorised?

(p−3)(p+5)(p-3)(p+5)

To factorise v2−9v+18v^2 - 9v + 18, what type of numbers are needed?

Two negative numbers

What is the formula for difference of two squares?

a2−b2=(a+b)(a−b)a^2 - b^2 = (a+b)(a-b)

What is x2−16x^2 - 16 factorised?

(x+4)(x−4)(x+4)(x-4)

What is 4t2−494t^2 - 49 factorised?

(2t+7)(2t−7)(2t+7)(2t-7)

For 5g2−9g−275g^2 - 9g - 27, what should you multiply to find the numbers?

5×−27=−1355 \times -27 = -135

For 6c2−23c+206c^2 - 23c + 20, which numbers work?

−15-15 and −8-8

In diagonal method for 2x2−x−32x^2 - x - 3, which pair gives −1x-1x?

(2x+1)(2x+1) and (x−3)(x-3)

How should you check if factorising is correct?

Expand the brackets

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