Question

(10-2x)(9-2x)+(9-2x)(7-2x)+(7-2x)(10-2x)

Answer 1

Step-by-step explanation:

okay....

(10-2x)(9-2x)+(9-2x)(7-2x)+(7-2x)(10-2x)

(19+4x)+(16+4x)+(17+4x)

4x{19+16+17}

4x=52

x=52/4

x=13

simple !!

Answer 2

Step-by-step explanation:

(10 - 2x)(9 - 2x)

4x² - 38x + 90

(9 - 2x)(7 - 2x)

4x² - 32 x + 63

(7 - 2x)(10 - 2x)

4x² - 34x + 70

add them all together:

4x² - 38x + 90 + 4x² - 32x + 63 + 4x² - 34x + 70

rearrange:

4x² + 4x² + 4x² - 38x - 32x - 34x + 90 + 63 + 70

= 12x² - 104x + 223

using graphing calculator to find the x values:

x = 3.8923748

x = 4.7742919