Chad was asked whether the following equation is an identity:
(3x + 2y)2 = (3x + 2y)(3x – 2y)...
Mathematics, 18.02.2020 08:31 lily3937
Chad was asked whether the following equation is an identity:
(3x + 2y)2 = (3x + 2y)(3x – 2y) + 2(2y)?
He performed the following steps:
(3x + 2y)?
Step 1, = 9x2 + 4y?
Step2 = 9.? + 4y? + 4y? – 4y?
Step3
= (9x² – 4y?) + 8y?
Stept
= (3x + 2y)(3x – 2y) + 2(2y)?
For this reason, Chad stated that the equation is a true identity.
Is Chad correct? If not, in which step did he make a mistake?
Answers: 1
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