1.

Factorise 10xsquare+3x-4​

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ANSWER:

now 3X can be written as 8x-5x as the PRODUCT of 8 and -5 will be -40 so the equation will BECOME

10x^{2} +8x-5x-4\\=2x(5x+4)-1(5x+4)\\=(2x-1)(5x-4) so the roots of the equation will be 1/2 and 4/5

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