using identities X + 4 into x minus 4
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X+4×x-4
=x square minus 16
aashvishah59:
x2-16 is correct answer
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(x+4)×(x-4)
(a+b)(a-b)=a^2-2ab+b^2
so, x^2-8x+16
now,
by factorisation method,
=x^2-4x-4x+16
=x(x-4)-4(x-4)
(x-4)(x-4)
so,x=4
(a+b)(a-b)=a^2-2ab+b^2
so, x^2-8x+16
now,
by factorisation method,
=x^2-4x-4x+16
=x(x-4)-4(x-4)
(x-4)(x-4)
so,x=4
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