Question

Using suitable identities to find the following product s: (3x+4) (3x-5).​

Answer 1

Answer:

(3x+4)(3x-5)

9x²-15x+12x-20

9x²-3x-20

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Answer 2

(3x+4) (3x-5)

Using the identity (x+a)(x+b)= x^2+ (a+b)x + (ab)x

=(x+a)(x+b)= 3x^2+(4-5)3x+(4*-5)3x

=9x^2+(-3x)+(60x)

=9x^2-3x+60x

= 9x^2+57x

therefore, (3x+4)(3x-5)= 9x^2+57x

I hope it will help you