Chad was asked whether the following equation is an identity:
(3x + 2y)^2= (3x + 2y)(3x – 2y) + 2(2y)^2 ?
He performed the following steps:
(3x + 2y)
Step 1
= 922 + 4y
Step 2
9r? – 4y + 4y? – 4y
Step 3
(9x² – 44²) + 8y²

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Will mark brainliest! ( explain the answer too, it can be one sentence)