Q. Rewrite the expression as a product of four linear factors:(10x2+x)2−11(10x2+x)+18Answer:
Define y as expression: Let's denote the expression inside the parentheses as y, where y=10x2+x. This will simplify our expression to a quadratic in terms of y.
Rewrite as quadratic in y: Now we rewrite the expression as a quadratic in y: (y)2−11y+18.
Factor quadratic expression: We need to factor the quadratic expression. To do this, we look for two numbers that multiply to 18 and add up to −11. These numbers are −9 and −2.
Substitute back for x: Factoring the quadratic expression gives us (y−9)(y−2).
Factor each quadratic further: Now we substitute back in for y to get the expression in terms of x: (10x2+x−9)(10x2+x−2).
Combine all factors: Each of these quadratic expressions can be factored further. We look for two numbers that multiply to −90 (10×−9) and add up to 1 (the coefficient of x) for the first quadratic, and two numbers that multiply to −20 (10×−2) and add up to 1 for the second quadratic.
Combine all factors: Each of these quadratic expressions can be factored further. We look for two numbers that multiply to −90 (10×−9) and add up to 1 (the coefficient of x) for the first quadratic, and two numbers that multiply to −20 (10×−2) and add up to 1 for the second quadratic.For the first quadratic, the numbers are 10 and −9. This gives us (10x−9)(x+1).
Combine all factors: Each of these quadratic expressions can be factored further. We look for two numbers that multiply to −90 (10×−9) and add up to 1 (the coefficient of x) for the first quadratic, and two numbers that multiply to −20 (10×−2) and add up to 1 for the second quadratic.For the first quadratic, the numbers are 10 and −9. This gives us (10x−9)(x+1).For the second quadratic, the numbers are 10×−90 and 10×−91. This gives us 10×−92.
Combine all factors: Each of these quadratic expressions can be factored further. We look for two numbers that multiply to −90(10×−9) and add up to 1 (the coefficient of x) for the first quadratic, and two numbers that multiply to −20(10×−2) and add up to 1 for the second quadratic.For the first quadratic, the numbers are 10 and −9. This gives us (10x−9)(x+1).For the second quadratic, the numbers are (10×−9)0 and (10×−9)1. This gives us (10×−9)2.Combining all the factors, we get the expression as a product of four linear factors: (10×−9)3.
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