Question

expand（5a+9b）（5a+3b）​

Answer 1

25a^2 +15ab +45ab+27b^2
=25a^2 +27b^2 +60ab

Answer 2

Answer:

this can be solved using idendities.

here the idendity (x+a)(x+b) can be used.

(x+a)(x+b )=x^2+ (a+b )x +ab

(5a+9b)(5a+3b)=(5a)^2+ (9b+3b)5a +9b*3b.

=25a^2 + 60ab + 27b^2. .......

please thank and mark brainliest

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