sum of two numbers is9 their product is 20find the sum of sqares and cubes
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let a and b be the numbers
a+b = 9 and a*b = 20
a^2 + b^2 = (a+b)^2 - 2ab = 9^2 - 40 = 81 - 40 = 41
a^3 + b^3 = (a+b)^3 - 3ab(a + b) = 9^3 - 60(9) = 729 - 540 = 189
hope it helps
a+b = 9 and a*b = 20
a^2 + b^2 = (a+b)^2 - 2ab = 9^2 - 40 = 81 - 40 = 41
a^3 + b^3 = (a+b)^3 - 3ab(a + b) = 9^3 - 60(9) = 729 - 540 = 189
hope it helps
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