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Find the value of t such that (5x^2 - 6x + 7)(4x^2 +tx + 10) = 20x^4 -9x^3+ 60x^2 - 39x + 70.

 Jun 15, 2022
 #1
avatar+578 
+2

It's 3, trust me

 

-Vinculum

 

smileysmileysmiley

 Jun 15, 2022
 #2
avatar+9459 
+4

Consider the coefficient of x^2 on both sides.

 

\(5(10) + (-6)(t) + 7(4) = 60\\ -6t + 78 = 60\\ t = 3\)

 

Yeah, Vinculum's answer is correct.

 Jun 15, 2022

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