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9a² + 12a + 4 + a² + 8a + 16 = 9a² + 24a + 16
9a² -9a² + a² +12a +8a -24a +4 + 16 -16 =0
a² - 4a + 4 = 0
(a - 2)(a -2) = 0
a = 2
2.
a) x² = 20² + 37,5²
x² = 400 + 1406,25
x² = 1806,25
x = √1806,25
x = 42,5
b) x = √(5/7)² - (4/7)²
= √9/49
= 3/7