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Verified answer
Akar dr 23+8akar7=akar dr 23+2.4 akar7
=akar dr 23+ 2akar16x7
4 nya dimasukan ke akar.jd 4 dikuadratkan.trz,kenapa dijadikan 2 karena sesuai dgn rumus:
akar dr a+b+2akar axb
maka=akar a + akar b
=akar dr 16+7+2akar16x7
=akar16 + akar7
=4+akar7