ตอบ:
# x = 2 #
# x = -1/4 #
คำอธิบาย:
ได้รับ -
# 4x ^ 2 = 2 + 7x #
# 4x ^ 2-7x-2 = 0 #
# x ^ 2-7 / 4X-4/2 = 0 #
# x ^ 2-7 / 4X-1/2 = 0 #
# x ^ 2-7 / 4x = 2/1 #
# x ^ 2-7 / 4x + 49/64 = 1/2 + 49/64 = (32 + 49) / 64 = 81/64 #
# (x ^ 2-7 / 8) ^ 2 = 81/64 #
# (x-08/07) = + - sqrt (81/64) #
# (x-08/07) = + - 8/9 #
# x = 9/8 + 8/7 = (9 + 7) / 8 = 16/8 = 2 #
# x = 2 #
# x = -9/8 + 7/8 = (- 9 + 7) / 8 = -2/8 = -1/4 #
# x = -1/4 #