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(√2 + 5)² = (√2)² + 2 × √2 × 5 + 5² = 2 + 10√2 + 25 = 27 + 10√2
(√11 - 2)(2x - 3) = 2√11x - 3√11 - 4x +6 = (2√11 - 4)x - 3√11 + 6
(2x+3)(2x-3) = 4x²-9
(√2+5)² =(√2)²+2*√2 *5+5²= 2+10√2+25=27+10√2
(√11-2)(2x-3)=2√11x-3√11-4x+6=(2√11-4)x-3√11+6