Question

resolva as esquações

a) x²-14x+49=0

b) 4x²-20x+25=0
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Answer 1

a) x²-14x+49=0

(x -7)² = 0

x -7 = 0

x = 7 ✓

b) 4x²-20x+25=0

(2x -5)² = 0

2x -5=0

2x=5

x = 5/2 ✓

Answer 2

a)ײ-14×+49

∆=196-196

∆=0

×=14±0/2

×′=×″

×=7

S={7}

b)4ײ-20×+25=0

∆=400-400

∆=0

×=20±0/8

×′=×″

×=20/8=5/2

S={5/2}