Math, asked by pallupradhan162, 1 year ago

(3x+4)(3x-5) how to do the sum by using identities

Answers

Answered by Shobana13

Using the identity (x+a)*(x+b)

Shobana13: (x+a)(x+b)= x^2+x (a+b)+ab so, (3x+4)(3x-5)=(3x)^2-3x (4-5)+[4×(-5)] = 9x^2-12x+15x-20 = 9x^2+3x-20

pallupradhan162: Ok

Shobana13: Hmm

pallupradhan162: Thank you soooooooooooooooooooo much

pallupradhan162: For helping

Shobana13: Thanks for marking mine as brainliest :)

Shobana13: :) my pleasure

pallupradhan162: Your welcome

pallupradhan162: ;-)

Shobana13: ...

Answered by prassanavinathi

(x+a)(x-y)
3 is the coeffecient of x.
Substitute values according to that

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