Answer:
x = 15.75
Step-by-step explanation:
I'm going to assume you mean solve for x so:
Answer:
Step-by-step explanation:
11x^{2}+x^{2}=\left(4x+8\right)\left(3x-3\right)
S10 = -150;
<span> the sum of next 10 terms = S20 - S10 => -550 = S20 + 150 => S20 = -700;
</span>S10 = -150 => 2a1 + 9r = -30;
S20 = -700 => 2a1 + 19r = -70;
Then 10r = -40 => r = -4 , and, 2a1 -36 = -30 => 2a1 = 6 => a1 = 3;