Tentukan nilai dari fungsi limit 4-x² per 3-√x²+5 untuk x mendekati 4!

jawab

limit (x --> 4) (4 - x^2) / (3 - √(x^2 + 5))
sub x = 4
limit = (4 - 4²) / (3 - √(4^2 +5)
limit = (4 -16)/ (3 - √(16+5))
limit = ( -12)/ (3 - √21)
limit = ( -12 )(3 + √21) / (3-√21) (3 +√21)
limit = -12(3 + √21) / (9 - 21)
limit = -12 (3 + √21) / (-12)
limit = 3 + √21