Question

If `[[3x,7],[-2,4]]=[[8,7],[6,4]]`, find the value of x

Answer 1

`[[3x,7],[-2,4]]=[[8,7],[6,4]]`

⇒12x+14=32−42

⇒12x+14=−10

⇒12x=−24

⇒x=−2

Hence, the value of x = −2.