Answer:
x=
10
429
≈2.071231518
x=−
10
429
≈−2.071231518
Step-by-step explanation:
12.7−xx=8.41
Multiply x and x to get x
2
.
12.7−x
2
=8.41
Subtract 12.7 from both sides.
−x
2
=8.41−12.7
Subtract 12.7 from 8.41 to get −4.29.
−x
2
=−4.29
Divide both sides by −1.
x
2
=
−1
−4.29
Expand
−1
−4.29
≈4.29 by multiplying both numerator and the denominator by 100.
x
2
=
−100
−429
Fraction
−100
−429
≈4.29 can be simplified to
100
429
=4.29 by removing the negative sign from both the numerator and the denominator.
x
2
=
100
429
Take the square root of both sides of the equation.
x=
10
429
x=−
10
429
16+15
combine like terms
the simplified answer is 31
Answer:
John and Mike are correct, Henry is incorrect.
Step-by-step explanation:
Try to find x = 4 for all the equations to find out who is correct.
John:
4x + 4 + 7x = 48
Combine like terms.
11x + 4 = 48
Subtract 4 from both sides.
11x = 44
Divide both sides by 11.
x = 4
John is correct.
Mike:
2x + 3 = 11
Subtract 3 from both sides.
2x = 8
Divide both sides by 2.
x = 4
Mike is correct.
Henry:
8x + 7 = 71
Subtract 7 from both sides.
8x = 64
Divide both sides by 8.
x = 8
Henry is incorrect.
