Find the mistake and correct. 10x+7 y = -!!
7x-2y = -1
STEP #1 2 (10x + 3y =-11)
7T-7x-2y=-1)
STEP #23 20x+14y = - 22
-49x - 4y = -1
- 29x = -23
-29
-29
or x = 0.79
x = 2
10 (0.79)+7y = -11
STEP 3
7,9+7y=-
-7.9
+y=-11.9
# 7
y=-1.7
같
STEP Ч:
60.79,-1.7)

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2