Answer:
3.25
Step-by-step explanation:
Answer:
C
Step-by-step explanation:
Here I copy the steps and indicate where the error is.
Square root of negative 2x plus 1 − 3 = x=> <span>this is the starting equation
</span>
√[ - 2x + 1] - 3 = x
Square root of negative 2x plus 1 − 3 + 3 = x + 3 in this step she added 3 to each side, which is fine
<span> Square root
of negative 2x plus 1 = x + 3 <span>she made the addtions => fine</span></span>
Square root of negative 2x plus 1 − 1 = x + 3 – 1 due to <span>plus 1 in inside the square root, this step will not help</span>
<span> Square root
of negative 2 x = x + 2 <span>wrong! she cannot simplify - 1 that is out of the square root with +1 that is inside the square root
</span></span>
<span>Then, from here on all is wrong, but she made other additional mistakes.</span>
(Square root of negative 2 x)2 = (x − 4)2 −2x <span> the right side should be (x+2)^2 which is x^2 + 4x +4 not (x-4)^2 - 2x</span>
Later she made a mistake changing the sign of -8x to +8x
Those are the mistakes. Finally, the global error is that she should verify whether the found values satisfied the original equation.
#1
5x + 10 + 13x -10 = 180
18x = 180
x = 180/18
x =10
answer: value of x = 10
#2
21x +5 +37x +1 = 180
58x + 6 = 180
58x = 180 -6
58x = 174
x = 174/58
x = 3
so 37x + 1
= 37(3) + 1
=111 + 1
=112
answer: measure of the highlight angel = 112
Answer:
Step-by-step explanation:
1) Factor out the x components of the equation
(x+3)(x+1)=0
2) Take each individual term and find the value for which the equation equals zero:
x+3=0 -> x=-3
x+1=0 -> x=-1
x = -3, -1
