急,大家可唔可以教吓我解方程啊3

5)
(2y - 3)2 = 8
2y - 3 = √8
2y = (2√2) + 3
y = [(2√2) + 3] / 2
y = [(2√2) + 3] / 2 or [ - (2√2) + 3] / 2
∴ y = 2.91 or 0.09


7)
(y + 2.5) 2 = 3.25
(y + 5/2) 2 = 13/3
y + 2.5 = √3.25
y = (√3.25) – 2.5
y = (√3.25) – 2.5 or - (√3.25) – 2.5
∴ y = - 0.70 or - 4.30



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