Mid Matematika
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1. 3 x 2 −7 x−6=−18 x 2 =−18=2 ×−9 −7 x=−7=2 +−9 = 3x 2 - 9x + 2x – 6 = 3x(x-3) + 2(x-3) = (3x+2) (x-3) 2. x+2 x+3 – x+3 x+2 = x+2 ( x+ 2) −x−3 ( x+3 ) ( x+ 3) ( x+2 ) = x 2 +2 x +2 x +4−x 2 −3 x−3 x− 9 ( x +3 ) ( x +2) = x 2 − x 2 +4 x−6 x +4−9 ( x + 3) ( x+2 ) = −2 x−5 ( x+3 ) ( x + 2) 3. x +5− x 2 x−5 = x−5 ( x ) +x−5 ( 5) −x 2 x−5 = x 2 −5 x+5 x−25−x 2 x−5 = x 2 −x 2 −5 x +5 x−25 x−5 = −25 x−5 = −25 5−x 4. 14+5=19:2= 9,5-5=4,5 (4 tahun 5 bulan) 5. 3 x 2 −9 + 2 x−3 = 3 +2 ( x+3 ) x 2 −9 ¿ 3+2 x +6 x 2 −9 = 2 x +9 x 2 −9 = 2 x +9 x 2 −9 = 2 x +9 ( x−3 )( x+ 3) 6. 16 x 2 −625= √ 16 =4 , √ x 2 =x, √ 625=25 1 Penyelesaian Soial-soal Mid Matematika
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Soa-soal Matematika
Transcript of Mid Matematika
1.= 3x2 - 9x + 2x 6= 3x(x-3) + 2(x-3)= (3x+2) (x-3)
2. = ==3. = ==4.14+5=19:2= 9,5-5=4,5 (4 tahun 5 bulan)5. = 6.= (4x-25) (4x+25)7.3 karena 2(3) -1 = 5 (Salah)-5 -11= 2(-5)-1 = -10-1= -11 (Benar)3 = 2 (3) -1 = 5 (Benar)18.x2 + 2x + 1 = (-3)2 + 2 (-3) +1= 9 - 6 +1 = 49.x2 + 2 = 2x + 5x2= 2x + 5 2x2 = 2x + 3x2 2x -3(x+1) (x-3) x= -1 x= 310.x2 13x + 20= (-3)2 13 (-3) + 20 = 9 + 39 + 20 = 68= (1)2 13 (1) + 20 = 1 - 13 + 20 = 8= (2)2 13 (2) + 20 = 4 26 + 20 = -2= (4)2 13 (4) + 20 = 16 - 52 + 20 = -16 (60, 8, -2, -16)11.2 x2 2x -12 x = = 2 ()2 2 () 12= 2 - - 12= = = = = 12.f(x)= ax + bf(1) = 7 = ax + b =7 = a(1) + b =7= b =7-a= 7 2 = 513.f(x) = ax + bf(1) = -1 = ax + b = -1 = a(1) + b = -1= b = -1- a = -1-3 = -4f(5)=11= ax + b = 11 = a(5) + b = 11= 5a 1 a = 11= 4a 1 = 11= 4a = 11 + 1= a = 12 a = 314.P(a) = -11f(x) = 25 x2= f(x) = 25 - x2= P(a) = 25 - x2= -11 = 25 - x2= 25 - x2 = -11= - x2 = -11 -25= - x2 = -36= x2 = 36= = x = 61Penyelesaian Soial-soal Mid Matematika
