What is 17 multiplied by 120?

Using the grid method, we know this is equal to (10100) + (1020) + (7100) + (720) = 1000+200+700+140 = 2040

CD

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f(x) = 6x³ + 13x² - 4. Use the factor theorem to show that (x+2) is a factor of f(x)


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Factorise fully 12x^2-20x+3


Factorize x^2 + 4x -5 and hence find the roots of the quadratic equation y = x^2 + 4x - 5.