Q. Rewrite the expression as a product of four linear factors:(10x2+3x)2−19(10x2+3x)+18Answer:
Identify expression as quadratic: Identify the given expression and recognize that it resembles a quadratic in form, where the variable part is 10x2+3x instead of a simple x. The expression is a quadratic in terms of 10x2+3x.
Rewrite as quadratic equation: Rewrite the expression as a quadratic equation: Let u=10x2+3x. Then the expression becomes u2−19u+18.
Factor the quadratic: Factor the quadratic equation: We need to find two numbers that multiply to 18 and add up to −19. These numbers are −1 and −18. So we can write the quadratic as (u−1)(u−18).
Substitute back for u: Substitute back for u: Replace u with (10x2+3x) in the factored form to get ((10x2+3x)−1)((10x2+3x)−18).
Expand linear factors: Expand each linear factor: We need to simplify ((10x2+3x)−1) and ((10x2+3x)−18) to get the linear factors. For the first factor, (10x2+3x−1), we can't simplify it further, so it remains as is. For the second factor, (10x2+3x−18), we also can't simplify it further, so it remains as is.
Recognize factors are quadratic: Recognize that the factors (10x2+3x−1) and (10x2+3x−18) are not linear, but quadratic. We need to factor each of these further to get linear factors.
Factor first quadratic: Factor the first quadratic: We need to factor 10x2+3x−1. This does not factor nicely, and we would typically use the quadratic formula to find its roots. However, since we are looking for linear factors and this is a homework problem, it's likely that there is a simpler solution. We should check for a mistake in the previous steps before proceeding.
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