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kendarriuskj1990
29.01.2020 •
Mathematics
What is the area of this rectangle?
a.
12 cm²
b.
12 cm
c.
35 cm²
d.
35 cm
Solved
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Ответ:
7 x 5 = 35 cm^2
Choice C
Hope that helps. -UF aka Nadia
Ответ:
x=3 is the extraneous solution
Step-by-step explanation:
|4x-42| = -10x
Since it's absolute value and we know that there are two possibilities, we need two equations to set up to solve for x.
1st equation:
4x - 42 = -10x2nd equation:
4x - 42 = 10xSolve both equations for x:
1st equation:4x - 42 = -10x14x-42 = 014x=42x = 32nd equation:4x-42=10x-6x-42=0-6x=42x=-7Plug in both values for x in the original equation to find the extraneous solution:
x=-7
|4x-42|=-10x|4(-7)-42|=-10(-7)|-28-42|=70|-70|=7070=70x=3
|4x-42|=-10x|4(3)-42|=-10(3)|-30|=-3030≠-30