Two mark exercise problems XII — task. Mathematics State Board, Class 7.

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Simplify using identities.

(i)

$(3p + q)(3p + r) =$

(ii)

$(3p + q)(3p - q) =$

(iii)

$(5x - 3y)^2 - (5x + 3y)^2 =$

Answer variants:

$9p^2 + 3p(q + r) + qr$

$9p^2 + q^2$

$60xy$

$-60xy$

$9p^2 + 3q(p + r) + qr$

$9p^2 - q^2$

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