Answer :
(4x + 7)² = 60
4x + 7 = +/-√(60)
4x + 7 = +/-√(4 · 15)
4x + 7 = +/-√(4)√(15)
4x + 7 = +/- 2√(15)
4x = -7 +/- 2√(15)
1/4 · 4x = 1/4(7 +/- 2√(15))
x = 1 3/4 +/- 1/2√(15)
4x + 7 = +/-√(60)
4x + 7 = +/-√(4 · 15)
4x + 7 = +/-√(4)√(15)
4x + 7 = +/- 2√(15)
4x = -7 +/- 2√(15)
1/4 · 4x = 1/4(7 +/- 2√(15))
x = 1 3/4 +/- 1/2√(15)
