Question

factorise 9(3x+1)² - 2(x-1)² please answer fast​

Answer 1

Answer:

79x² + 58x + 7

Step-by-step explanation:

9(3x+1)² - 2(x-1)²

9 (9x² + 6x + 1) - 2 (x² + 1 - 2x)

81 x² - 2x² +54x + 4x + 9 - 2

79x² + 58x + 7

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Answer 2

Answer:

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Step-by-step explanation:

$9(3x+1)^2 - 2(x-1)^2\\\\Using\:\:formula\:\: (a+b)^2 = a^2+2ab+b^2 \:\:\:and\:\:(a-b)^2=a^2-2ab+b^2, we\:\:get:-\\\\9[(3x)^2 +(2\times3x\times2)+(1)^2 ] - 2 [(x)^2 - 2 \times x \times1+(1)^2]\\\\9 (9x^2 + 6x + 1) - 2 (x^2 - 2x+1)\\\\81x^2+54x+9-2x^2+4x-2\\\\81 x^2 - 2x^2 +54x + 4x + 9 - 2\\\\79x^2 + 58x + 7$