Question

factorise 9y2 -25y-100

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Answer 1

Here is your answer mate...

Answer 2

${9y}^{2} - 25x - 100 \\ \\ = 9 {y}^{2} - 45x + 20x - 100 \\ \\ = 9x(x - 5) + 20(x - 5) \\ \\ =( 9x + 20)(x - 5)$

Thus factorized