Answers

2016-07-01T23:54:12+08:00
√- square root sign 1. 4x²-225=0 √4x²=+-√225 2x=+-15 (divide both side into 2) x=+-15/2 2. 3h²-147=0 (divide into 3) h²-49=0 √h²=+-√49 h=+-7 3. (x-4)²=169 √(x-4)²=+-√169 x-4=+-13 x-4=13 | x-4=-13 x=13+4 | x=-13+4 x=17 | x=-9 {-9,17} 4. (k+7)²=289 √(k+7)²=+-√289 k+7=+-17 k+7=17 | k+7=-17 k=17-7 | k=-17-7 k=10 | k=-24 {-24,10} 5. (2s-1)²=225 √(2s-1)²=+-√225 2s-1 =+-15 2s-1=15 | 2s-1=-15 2s=15+1 | 2s=-15+1 2s=16 | 2s=-14 (divide both linear equations into 2) s=8 | s=-7 {-7,8}
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Okay.
Answer in Number 1. √-will symbolize the square root
1.4x²-225=0 √4x²=+-(postive negative)√225 2x²=+-15 (divide both side by 2) 2x/2=+-15/2 answer: x=+-15/2
2. 3h²-147=0 (divide the equation by 3) 3h²/3-147/3=0 h²-49=0 √h²=+-√49 answer: h=+-7
tnx poe!! <3