Răspuns:
Explicație pas cu pas:
la a si b:
a) = (√x-2)(√x-7) = (√x-6)(√x-4)
= x-7√x-2√x+14 = x-4√x-6√x+24
= -9√x+14 = -10√x+24
= -9√x+10√x = 24-14
= √x = 10
x = 100
b) = (2√x-1)(3√x-2) = (2√x-3)(3√x+6)
= 6x-4√x-3√x+2 = 6x+12√x-9√x-18
= -4√x-3√x+2 = 12√x-9√x-18
= -7√x+2 = 3√x-18
= -7√x-3√x = -18-2
= -10√x = -20
= √x = 2
x = 4
