Find the value of t such that (5x^2 - 6x + 7)(4x^2 +tx + 10) = 20x^4 -9x^3+ 60x^2 - 39x + 70.
+592 You want to find all the terms that have x as the variable.
This means: tx * 7 + 10 * -6x = 7tx - 60x, or (7t - 60)x.
Now we look at the coefficient in the question. The coefficient of x is -39.
7t - 60 = -39
7t = 21
t = 3 and bam that's your answer :)
