Two mark example problems II — task. Mathematics State Board, Class 7.

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1. Simplify by using the identity

$(a + b)(a - b) = a^2 - b^2$ .

(i)

$(3x + 4)(3x - 4) =$

(ii)

$53 \times 47 =$

2. Simplify using the identity

$(x + a)(x + b) = x^2 + x(a + b) + ab$ .

$43 \times 36 =$

Answer variants:

$2149$

$9x^2 + 16$

$1548$

$9x^2 - 16$

$1854$

$2491$

$1458$

$2941$

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