Q. Rewrite the expression as a product of four linear factors:(5x2−12x)2−2(5x2−12x)−63Answer:
Write Given Expression: Let's first write down the given expression:(5x2−12x)2−2(5x2−12x)−63We will try to recognize this as a quadratic in form of (ax2+bx+c) where x is replaced by (5x2−12x).
Recognize Quadratic Form: To factor the quadratic, we look for two numbers that multiply to ac (where a is the coefficient of the squared term and c is the constant term) and add to b (the coefficient of the linear term). In this case, a=1, b=−2, and c=−63. ac=1×−63=−63We need two numbers that multiply to −63 and add to −2.
Factor Quadratic: The two numbers that satisfy these conditions are −9 and +7 because −9×7=−63 and −9+7=−2.Now we can rewrite the quadratic as:(5x2−12x−9)(5x2−12x+7)
Find Two Numbers: Next, we need to factor each quadratic factor further into two linear factors. We start with the first quadratic factor:5x2−12x−9We look for two numbers that multiply to 5×−9=−45 and add to −12.
Rewrite Quadratic: The two numbers that satisfy these conditions are −15 and +3 because −15×3=−45 and −15+3=−12. We can now factor the first quadratic factor as: (5x−15)(x+3)
Factor First Quadratic: Now we factor the second quadratic factor:5x2−12x+7We look for two numbers that multiply to 5×7=35 and add to −12.
Factor Second Quadratic: The two numbers that satisfy these conditions are −5 and −7 because −5×−7=35 and −5−7=−12.We can now factor the second quadratic factor as:(5x−7)(x−1)
Combine Linear Factors: Combining all the linear factors, we get the expression as a product of four linear factors: \(5x - 15)(x + 3)(5x - 7)(x - 1)\