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9 into x + a whole square - 4 x square factorise |
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Answer» 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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