UPSKILL MATH PLUS
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Learn moreFactorise the following algebraic expressions by using the identity \(a^2 - b^2 = (a + b)(a - b)\).
(i) \(z^2 - 16 =\)
(ii) \(9 - 4y^2 =\)
(iii) \(25a^2 - 49b^2 =\)
Answer variants:
\((5a + 7b)(5a - 7b)\)
\((z - 4)(z - 4)\)
\((z + 4)(z - 4)\)
\((5a - 7b)(5a - 7b)\)
\((2y + 3)(2y - 3)\)
\((3 + 2y)(3 - 2y)\)
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