(2x + 7) (5x + 9) - (4x2 + 1) (x - 3)
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2x(5x+9)+7(5x+9)-1(4 x 2+1)(x-3)
10x' +18x +35x+63 -1(4 x 2 +1)(x-3)
10x' +53x +63-1(4 x 2 +1)(x-3)
10x'+53x +63 -1(8+1)(x-3)
10x'+53x +63 -1(9)(x-3)
10x' +53x +63 -9 (x-3)
10x' + 53x +63 - 9x +27
10x' + 53x +90 - 9x
10x' + 44x +90
(from second line their i have write 10x' this inverted cooma ('). refers to square i.e 10x square)
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