Factorisation

Hong Kong

Stage 4 - Stage 5

Answer the following.

a

Expand $\left(x+5\right)\left(x-5\right)$(`x`+5)(`x`−5).

b

Hence factorise $x^2-25$`x`2−25.

Easy

Approx a minute

Which positive integer must go in the spaces to make the statement true?

What expression must go in the space to make the statement true?

One linear factor of $x^2-49$`x`2−49 is $x+7$`x`+7. What is the other factor?

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