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9th science ex 7 2 malik faisal ptb

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2. ∎𝑺𝒐𝒍𝒗𝒆 𝒕𝒉𝒆 𝒇𝒐𝒍𝒍𝒐𝒘𝒊𝒏𝒈 𝒆𝒒𝒖𝒂𝒕𝒊𝒐𝒏𝒔. i) │𝟑𝒙 − 𝟓│ = 𝟒 (Solution): │3𝑥 − 5│ = 4 𝟑𝒙 − 𝟓 = 𝟒 𝟑𝒙 − 𝟓 = −𝟒 𝟑𝒙 = 𝟒 + 𝟓 𝟑𝒙 = −𝟒 + 𝟓 𝟑𝒙 = 𝟗 𝟑𝒙 = 𝟏 𝟏 𝒙=𝟑 𝒙= 𝟑 3𝑥 − 5 = ±4 𝟏 𝑺𝒐𝒍𝒖𝒕𝒊𝒐𝒏 𝑺𝒆𝒕 = { , 𝟑} 𝟑 𝟏 ii) │𝟑𝒙 + 𝟐│ − 𝟒 = 𝟏𝟏 𝟐 (Solution):│ │ 2× 3𝑥+2 2 3𝑥+2 │ = 11 + 4 │ = 15 2 │3𝑥+2│ 2 = 15 × 2 │3𝑥 + 2│ = 30 3𝑥 + 2 = ±30 𝟑𝒙 + 𝟐 = 𝟑𝟎 𝟑𝒙 = 𝟑𝟎 − 𝟐 𝟑𝒙 = 𝟐𝟖 𝟐𝟖 𝒙= 𝟑 𝟑𝒙 + 𝟐 = −𝟑𝟎 𝟑𝒙 = −𝟑𝟎 − 𝟐 𝟑𝒙 = −𝟑𝟐 −𝟑𝟐 𝒙= 𝟑 𝟐𝟖 −𝟑𝟐 𝑺𝒐𝒍𝒖𝒕𝒊𝒐𝒏 𝑺𝒆𝒕 = { , } 𝟑 𝟑 iii) │𝟐𝒙 + 𝟓│ = 𝟏𝟏 (Solution): 2𝑥 + 5 = ±11 𝟐𝒙 + 𝟓 = 𝟏𝟏 𝟐𝒙 = 𝟏𝟏 − 𝟓 𝟐𝒙 = 𝟔 𝟔 𝒙= 𝟐 𝒙=𝟑 𝟐𝒙 + 𝟓 = −𝟏𝟏 𝟐𝒙 = −𝟏𝟏 − 𝟓 𝟐𝒙 = −𝟏𝟔 −𝟏𝟔 𝒙= 𝟐 𝒙 = −𝟖 𝑺𝒐𝒍𝒖𝒕𝒊𝒐𝒏 𝑺𝒆𝒕 = {−𝟖, 𝟑} iv) │𝟑 + 𝟐𝒙│ = │𝟔𝒙 − 𝟕│ (Solution): 3𝑥 + 2 = ±6𝑥 − 7 𝟑 + 𝟐𝒙 = −(𝟔𝒙 − 𝟕) 𝟑 + 𝟐𝒙 = −𝟔𝒙 + 𝟕 𝟑 − 𝟕 = −𝟔𝒙 − 𝟐𝒙 −𝟖𝒙 = − ...
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