9 into x + a whole square - 4 x square factorise
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Answer:(x+3a)(5x+3a)
Step-by-step explanation:
9(x+a)^2-4x^2
=9{x^2+2ax+a^2}-4x^2
=9x^2+18ax+9a^2-4x^2
=5x^2+18ax+9a^2
=5x^2+15ax+3ax+9a^2
=5x(x+3a)+3a(x+3a)
=(x+3a) (5x+3a)
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