I think my previous answer was right. But check with your teacher tomorrow.
3x^2 - 5x
when x=-2 we get
3(-2)^2 - 5(-2)
= 3(4) + 10
= 12 + 10
Ms Sue read the question as
(3x)^2 - 5x
You originally typed in "words" without brackets as
"3x squared ..... " , which when sounded out becomes 3x^2
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