7. Simplify the following
(i) (2x + 3y)(2x - 3y)
(iv) (x - 1)(x-2)(x-3)
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Step-by-step explanation:
i)(2x+3y)(2x-3y)=(2x)^2-(3y)^2=4x^2-9x^2
ii)(x-1)(x-2)(x-3)
=(x^2-2x-x+2)(x-3)
=(x^2-3x+2)(x-3)
=x^3-3x^2-3x^2+9x+2x-6
=x^3-6x^2+11x-6
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